Physaria oregona |
Physaria navajoensis |
|
---|---|---|
Oregon twin-pod |
Navajo bladderpod |
|
Habit | Perennials; caudex simple, (cespitose); (silvery) pubescent throughout, trichomes (stalked), few-rayed, rays furcate or imperfectly so, (tuberculate throughout). | Perennials; caudex branched, (woody, pulvinate-cespitose, forming hard, hemispherical mats, basal parts covered with persistent leaf bases); densely (silvery gray) pubescent, trichomes mostly 5-rayed, rays bifurcate, slightly fused at base, (umbonate, strongly tuberculate except nearly smooth over umbo). |
Stems | several from base, erect or somewhat decumbent, (unbranched), 1–3.5 dm. |
several from base (crowded), erect, not exceeding leaves. |
Basal leaves | (petiole slender, usually incised or with broad teeth along petiole); blade obovate, 4–6 cm, margins entire. |
usually absent. |
Cauline leaves | blade oblanceolate or broader, 1.5–2.5 cm, margins entire or sparsely dentate, (apex acute). |
(petiole not differentiated from blade); blade linear-oblanceolate, 3–8(–13) mm, margins entire. |
Racemes | somewhat loose, (5–15 cm). |
(secund), dense, corymbose, (few-flowered, not or barely exceeding leaves). |
Flowers | sepals oblong, 5–7 mm; petals (lemon yellow), spatulate, 9–12 mm. |
sepals (yellow-green), linear to narrowly triangular, 3.7–4.8 mm, (lateral pair subsaccate); petals (deep yellow, slightly orange in center), spatulate, 5.2–6.5 mm, (claw joined at right angle). |
Fruiting pedicels | (spreading or ascending, curved, fruits not pendent), 10–20 mm. |
(ascending to divaricate-ascending, straight), 3.5–6 mm. |
Fruits | didymous, obreniform, moderately inflated, angustispetate, (8–)10–12(–15) × 10–14(–16) mm, (papery, not keeled, basal sinus absent, apical sinus broad and open); valves (retaining seeds after dehiscence, rounded or irregular), loosely pubescent, trichomes spreading; replum broadly lanceolate, as wide as or wider than fruit, apex acute; ovules 8 per ovary; style 1–2 mm. |
(becoming reddish or copper-colored in age), ovate, often slightly compressed (at margins apically), 3–5 mm, (apex acute); valves (not retaining seeds after dehiscence), glabrous; (septum perforate or not); ovules 4–8 per ovary; style 1.8–3 mm. |
Seeds | flattened. |
plump or slightly flattened, (strongly mucilaginous). |
2n | = 8. |
|
Physaria oregona |
Physaria navajoensis |
|
Phenology | Flowering Apr–Jun. | Flowering May-early Jun. |
Habitat | Gravelly banks, stream shores, rocky slopes, dry hillsides, serpentine soils | Pinyon-juniper communities on nearly barren outcrops of Todilto Limestone |
Elevation | 900-1900 m (3000-6200 ft) | 2200-2400 m (7200-7900 ft) |
Distribution |
ID; OR; WA
|
AZ; NM |
Discussion | Of conservation concern. Physaria navajoensis is morphologically similar to 85. P. tumulosa of southern Utah, differing subtly. Physaria navajoensis has petals slightly orange at the junction of blade and claw, a sharp bend at that junction giving the flower a flat-topped appearance, and strongly mucilaginous seeds. Physaria tumulosa has pure yellow petals that gently flex at the junction of blade and claw, and seeds that are not mucilaginous. Molecular data (pers. obs.) show that these two species are not directly related. A population of plants on Deer Spring Point, Kane County, Utah, appears to be this species, but molecular data indicate that it is probably a hybrid between P. tumulosa and, most likely, P. intermedia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 7, p. 655. | FNA vol. 7, p. 651. |
Parent taxa | Brassicaceae > tribe Physarieae > Physaria | Brassicaceae > tribe Physarieae > Physaria |
Sibling taxa | ||
Synonyms | Coulterina oregona, Lesquerella oregona | Lesquerella navajoensis |
Name authority | S. Watson: Proc. Amer. Acad. Arts 17: 363. (1882) | (O’Kane) O’Kane & Al-Shehbaz: Novon 12: 325. (2002) |
Web links |